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please answer fast and give a detailed solution too.

please answer fast and give a detailed solution too.

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Grade:11

1 Answers

Ritesh Khatri
76 Points
5 years ago
Using Identity Sinx = Cos(90-x) we can write
(cos20 – cos(90-20))/(cos20 + cos(90-20))
 
which is equal to
(cos20 – cos(70))/(cos20 + cos(70))
 
Now using transformation formula we get
 
[-2Sin45Sin(-25)]/[2cos45Cos25]
 
which gives Tan25

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